US20110089314A1 - Compact tap monitor - Google Patents
Compact tap monitor Download PDFInfo
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- US20110089314A1 US20110089314A1 US12/905,478 US90547810A US2011089314A1 US 20110089314 A1 US20110089314 A1 US 20110089314A1 US 90547810 A US90547810 A US 90547810A US 2011089314 A1 US2011089314 A1 US 2011089314A1
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- 230000003287 optical effect Effects 0.000 claims abstract description 41
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 238000003384 imaging method Methods 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
Definitions
- the present invention relates to a compact optical tap monitor, and in particular to an optical tap monitor including a uni-directivity solution preventing superfluous light from entering the photodetector housing for increasing the accuracy of the photodetector measurement.
- a conventional integrated optical tap monitor 10 in accordance with the present invention includes two waveguides, an input fiber 1 and an output fiber 2 , a collimating lens combination 3 , a tap filter or tap coating 4 , an imaging lenses combination 6 , and one photodetecter (PD) package 8 , including a PD chip 9 .
- PD photodetecter
- a first portion of the collimated beam is reflected by the tap filter or coating 4 to the lens combination 3 , which focuses the first portion into the output fiber 2 .
- a second portion of the collimated beam is focused by the imaging lens combination 6 onto the PD chip 9 to monitor the output light power of the input beam.
- any light launched or back reflected from the output fiber 2 will also be focused onto the PD chip 9 , providing incorrect measurements of the power of the light portion coming from the input fiber 1 .
- An object of the present invention is to overcome the shortcomings of the prior art by providing a lensing arrangement, which separates the light coming from the input fiber and the output fiber, and a mask for preventing any of the light from the output fiber from entering the photodetector package.
- the present invention relates to a compact optical tap monitor device comprising:
- a collimating lens for collimating the optical signal
- a tap filter for receiving the collimated optical signal at an acute angle of incidence, for reflecting a first portion of the optical signal at an acute angle of reflection, and for passing a second portion of the optical signal
- an imaging lens for focusing the second portion of the optical signal, and for spatially separating light from the input waveguide from light from the output waveguide;
- a photodetector including an active area for receiving the second portion of the optical signal and for providing a measure of the optical power in the second portion;
- a mask covering a portion of the active area blocking light from the output waveguide from the active area of the photodetector.
- FIG. 1 illustrates a conventional optical tap monitor
- FIG. 2 illustrates a cross-sectional view of an optical tap monitor in accordance with the present invention
- FIG. 3 illustrates a photodetector package of the optical tap monitor of FIG. 2 ;
- FIG. 4 illustrates an alternative embodiment of the mask of the photodetector package of FIG. 2 .
- an integrated optical tap monitor 11 in accordance with the present invention includes two waveguides, an input fiber 12 and an output fiber 13 , a collimating lens combination, e.g. graded index lens 14 , a tap filter or tap coating 16 , an imaging lenses combination, e.g. graded index lens 17 , a mask or spacer 18 , and one monitor photodetecter (PD) package 19 , including a photodetector (PD) 21 .
- PD photodetecter
- Any waveguide or any light transmission medium can be used in place of the input and output fibers 1 and 2 .
- a first portion B F of the collimated beam A C is reflected by the tap filter or coating 16 at an acute angle of reflection in the lens combination 14 , which focuses the first portion B F into the output fiber 13 .
- a second smaller (1% to 10%) portion C F of the collimated beam A C is focused by the imaging lens combination 17 through a clear portion of the mask 18 into the PD package 19 and onto the PD 21 to monitor the output light power of the input beam A.
- the optical axes OA 1 of the collimating lens 14 and the optical axis OA 2 of the imaging lens 17 are aligned colinear with each other, with the input fiber 12 spaced the same distance therefrom as the output fiber 13 .
- Any light D F launched r reflected from the output fiber 13 , which passes through the tap filter 16 is directed to a masked portion of the mask 18 , which prevents the light D F from entering into the PD package 19 and from onto the photodetector 21 .
- the tapped portion C F of the input light A is directed to one side of the optical axes OA 1 and OA 2 of the lenses 14 and 17 , while the superfluous light D F is directed to the opposite side of the optical axes OA 1 and OA 2 .
- the photodetector 21 is preferably positioned on the one side of the optical axes OA 1 and OA 2 , while the masked portion of the mask 18 is positioned on the opposite side of the optical axes OA 1 and OA 2 .
- Other arrangements, in which symmetry between the input and output fibers 12 and 13 , and the lenses 14 and 17 are also possible.
- the separated distance between the focused light C F and the superfluous light D F exiting the lens 17 depends on the distance between the input and output fibers 12 and 13 , and the combination of the focal lengths of the collimating lens 14 with the focusing lens 17 .
- unwanted reflected light will still enter the packaged photodetector 19 , resulting in overly high power readings by the photodetector 21 .
- FIG. 1 The typical structure of an integrated PD monitor is illustrated in FIG. 1 ; however, the monitor PD 11 with mask or spacer 18 can be reduced in size, and a packaged PD 19 can be connected to the lens 17 directly, so the whole assembly size becomes very compact integrated unit, as illustrated in FIG. 2 .
- a dual fiber pigtail 22 containing both the input and output fibers 12 and 13 , can be connected together, e.g. fixed with adhesive, with the collimating lens 14 , and the imaging lens 17 with the tap filter 16 coated on either one of the collimating lens 14 or the imaging lens 17 or on a separate substrate therebetween.
- An example of the size of the packaged PD 11 with mask or spacer 18 is ⁇ 1.8 mm ⁇ 1.8 mm ⁇ 1.2 mm.
- the shape and design of the monitor PD package 19 is not essential, and depends on the structure of the overall assembly.
- the uni-directivity refers to light coming from one direction having much more power than light coming from another direction, e.g. when light is launched from the input fiber 12 , the photodetector 21 has a normal response I 1 , but when light is launched from the output fiber 13 , the photodetector 21 has a much lower response I 2 .
- Typical requirements call for ⁇ 10*log(I 2 /I 1 )>15 dB or more.
- a typical packaged photodetector 21 includes a photodetector chip 25 with an active area 22 mounted on a substrate 23 .
- Solder pads 24 are provided on the substrate 23 for electrically connecting the photodetector chip 25 with electrical leads 26 extending from opposite sides of the photodetector 21 .
- a transparent, e.g. clear glass, window 27 is placed over the photodetector chip 25 to protect it from elements in the environment.
- the mask or spacer 18 prevents the reflected light from the output fiber 13 from entering the photodetector package 19 and being detected by the PD chip 25 .
- the mask portion 28 can be rectangular in shape, thereby having a straight edge parallel to the edge of the window 27 , covering a fraction of the opening of the photodetector package 19 and the active area 22 on the side of the photodetector package 19 to where the reflected light D F is directed by the lens 17 , as shown in FIG. 2 .
- the exact shape of the mask portion 28 is not essential; however, it ideally covers 1 ⁇ 3 ⁇ 2 ⁇ 3, preferably 0.4 to 0.6, of the PD active area 22 based on the imaging points spacing distance and direction of the reflected light to the PD chip 25 , as illustrated in FIG. 4 , for intersecting the reflected light and preventing it from becoming incident on the active area 22 of the PD chip 25 .
- the masked portion 28 can be placed on or over the glass window 27 , as illustrated in FIG. 3 or disposed inside the glass window 27 directly on or over the PD chip 25 covering a portion of the active area 22 where the reflected light would enter, as illustrated in FIG. 4 , thereby preventing the PD chip 25 from measuring the reflected light.
- the mask portion 28 can be made out or any suitable material, e.g. metal, plastic, epoxy, glue or any shading light material. Optically absorbing or reflecting coatings can also be used.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
- The present invention claims priority from U.S. Patent Application No. 61/251,981 filed Oct. 15, 2009, which is incorporated herein by reference for all purposes.
- The present invention relates to a compact optical tap monitor, and in particular to an optical tap monitor including a uni-directivity solution preventing superfluous light from entering the photodetector housing for increasing the accuracy of the photodetector measurement.
- With reference to
FIG. 1 , a conventional integrated optical tap monitor 10 in accordance with the present invention includes two waveguides, aninput fiber 1 and anoutput fiber 2, acollimating lens combination 3, a tap filter ortap coating 4, animaging lenses combination 6, and one photodetecter (PD)package 8, including aPD chip 9. - Light, launched from the
input fiber 1, is collimated by thelens combination 3, and directed onto the tap filter or coating 4. A first portion of the collimated beam is reflected by the tap filter or coating 4 to thelens combination 3, which focuses the first portion into theoutput fiber 2. A second portion of the collimated beam is focused by theimaging lens combination 6 onto thePD chip 9 to monitor the output light power of the input beam. - Unfortunately, any light launched or back reflected from the
output fiber 2 will also be focused onto thePD chip 9, providing incorrect measurements of the power of the light portion coming from theinput fiber 1. - An attempt at improving the conventional optical tap module is disclosed in U.S. Pat. No. 7,333,693, issued Feb. 19, 2008 to Nagata et al, in which light from the input fiber and light from the output fiber are directed in slightly different directions by an imaging lens. Unfortunately, unwanted reflected light will still enter the packaged
photodetector 8, resulting in overly high power readings by thephotodetector chip 9 due to multiple reflections off the walls of thephotodetector package 8. - An object of the present invention is to overcome the shortcomings of the prior art by providing a lensing arrangement, which separates the light coming from the input fiber and the output fiber, and a mask for preventing any of the light from the output fiber from entering the photodetector package.
- Accordingly, the present invention relates to a compact optical tap monitor device comprising:
- an input waveguide for launching an optical signal;
- a collimating lens for collimating the optical signal;
- a tap filter for receiving the collimated optical signal at an acute angle of incidence, for reflecting a first portion of the optical signal at an acute angle of reflection, and for passing a second portion of the optical signal;
- an output waveguide spatially separated from the input waveguide for outputting the first portion of the optical signal;
- an imaging lens for focusing the second portion of the optical signal, and for spatially separating light from the input waveguide from light from the output waveguide;
- a photodetector including an active area for receiving the second portion of the optical signal and for providing a measure of the optical power in the second portion;
- a mask covering a portion of the active area blocking light from the output waveguide from the active area of the photodetector.
- The invention will be described in greater detail with reference to the accompanying drawings which represent preferred embodiments thereof, wherein:
-
FIG. 1 illustrates a conventional optical tap monitor; -
FIG. 2 illustrates a cross-sectional view of an optical tap monitor in accordance with the present invention; -
FIG. 3 illustrates a photodetector package of the optical tap monitor ofFIG. 2 ; and -
FIG. 4 illustrates an alternative embodiment of the mask of the photodetector package ofFIG. 2 . - With reference to
FIG. 2 , an integratedoptical tap monitor 11 in accordance with the present invention includes two waveguides, aninput fiber 12 and anoutput fiber 13, a collimating lens combination, e.g. gradedindex lens 14, a tap filter ortap coating 16, an imaging lenses combination, e.g. gradedindex lens 17, a mask orspacer 18, and one monitor photodetecter (PD)package 19, including a photodetector (PD) 21. Any waveguide or any light transmission medium can be used in place of the input andoutput fibers - Light, launched from the
input fiber 1, is collimated by thelens combination 14 forming collimated light AC, and directed onto the tap filter or coating 16. A first portion BF of the collimated beam AC is reflected by the tap filter or coating 16 at an acute angle of reflection in thelens combination 14, which focuses the first portion BF into theoutput fiber 13. A second smaller (1% to 10%) portion CF of the collimated beam AC is focused by theimaging lens combination 17 through a clear portion of themask 18 into thePD package 19 and onto thePD 21 to monitor the output light power of the input beam A. Ideally, the optical axes OA1 of thecollimating lens 14 and the optical axis OA2 of theimaging lens 17 are aligned colinear with each other, with theinput fiber 12 spaced the same distance therefrom as theoutput fiber 13. Any light DF launched r reflected from theoutput fiber 13, which passes through thetap filter 16 is directed to a masked portion of themask 18, which prevents the light DF from entering into thePD package 19 and from onto thephotodetector 21. - Due to the symmetry of the input and
output fibers imaging lenses lenses photodetector 21 is preferably positioned on the one side of the optical axes OA1 and OA2, while the masked portion of themask 18 is positioned on the opposite side of the optical axes OA1 and OA2. Other arrangements, in which symmetry between the input andoutput fibers lenses - The separated distance between the focused light CF and the superfluous light DF exiting the
lens 17 depends on the distance between the input andoutput fibers collimating lens 14 with the focusinglens 17. Unfortunately, without themask 18, unwanted reflected light will still enter the packagedphotodetector 19, resulting in overly high power readings by thephotodetector 21. - The typical structure of an integrated PD monitor is illustrated in
FIG. 1 ; however, themonitor PD 11 with mask orspacer 18 can be reduced in size, and a packagedPD 19 can be connected to thelens 17 directly, so the whole assembly size becomes very compact integrated unit, as illustrated inFIG. 2 . Adual fiber pigtail 22, containing both the input andoutput fibers collimating lens 14, and theimaging lens 17 with thetap filter 16 coated on either one of thecollimating lens 14 or theimaging lens 17 or on a separate substrate therebetween. An example of the size of the packagedPD 11 with mask orspacer 18 is <1.8 mm×1.8 mm×1.2 mm. - The shape and design of the
monitor PD package 19 is not essential, and depends on the structure of the overall assembly. The uni-directivity refers to light coming from one direction having much more power than light coming from another direction, e.g. when light is launched from theinput fiber 12, thephotodetector 21 has a normal response I1, but when light is launched from theoutput fiber 13, thephotodetector 21 has a much lower response I2. Typical requirements call for −10*log(I2/I1)>15 dB or more. - Below is a chart of experimental results for the
PD package 19 in accordance with the present invention indicating directivity above 19 dB in all cases. -
Photocurrent of PD 11Input Incident from input Incident from output Directivity Number Power fiber 1 fiber 2 (dB) 1 4 mW 40 μA 0.1 μA 26.0 2 4 mW 38 μA 0.4 μA 19.8 3 4 mW 42 μA 0.1 μA 26.2 4 4 mW 34.5 μA 0.3 μA 20.6 5 4 mW 46.5 μA 0.3 μA 21.9 - With reference to
FIG. 3 , a typical packagedphotodetector 21 includes aphotodetector chip 25 with anactive area 22 mounted on asubstrate 23.Solder pads 24 are provided on thesubstrate 23 for electrically connecting thephotodetector chip 25 withelectrical leads 26 extending from opposite sides of thephotodetector 21. A transparent, e.g. clear glass,window 27 is placed over thephotodetector chip 25 to protect it from elements in the environment. - Using the mask or
spacer 18 prevents the reflected light from theoutput fiber 13 from entering thephotodetector package 19 and being detected by thePD chip 25. Themask portion 28 can be rectangular in shape, thereby having a straight edge parallel to the edge of thewindow 27, covering a fraction of the opening of thephotodetector package 19 and theactive area 22 on the side of thephotodetector package 19 to where the reflected light DF is directed by thelens 17, as shown inFIG. 2 . The exact shape of themask portion 28 is not essential; however, it ideally covers ⅓˜⅔, preferably 0.4 to 0.6, of the PDactive area 22 based on the imaging points spacing distance and direction of the reflected light to thePD chip 25, as illustrated inFIG. 4 , for intersecting the reflected light and preventing it from becoming incident on theactive area 22 of thePD chip 25. The maskedportion 28 can be placed on or over theglass window 27, as illustrated inFIG. 3 or disposed inside theglass window 27 directly on or over thePD chip 25 covering a portion of theactive area 22 where the reflected light would enter, as illustrated inFIG. 4 , thereby preventing thePD chip 25 from measuring the reflected light. - The
mask portion 28 can be made out or any suitable material, e.g. metal, plastic, epoxy, glue or any shading light material. Optically absorbing or reflecting coatings can also be used.
Claims (9)
Priority Applications (1)
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US12/905,478 US8664584B2 (en) | 2009-10-15 | 2010-10-15 | Compact tap monitor with a reflection mask |
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US25198109P | 2009-10-15 | 2009-10-15 | |
US12/905,478 US8664584B2 (en) | 2009-10-15 | 2010-10-15 | Compact tap monitor with a reflection mask |
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US20110089314A1 true US20110089314A1 (en) | 2011-04-21 |
US8664584B2 US8664584B2 (en) | 2014-03-04 |
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CN (1) | CN102043209B (en) |
Cited By (3)
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US20180039030A1 (en) * | 2016-08-05 | 2018-02-08 | Santec Corporation | Detection device |
CN108020888A (en) * | 2016-11-03 | 2018-05-11 | Ii-Vi有限公司 | A kind of optical branching monitor |
CN108873159A (en) * | 2018-06-19 | 2018-11-23 | 武汉电信器件有限公司 | A kind of integrated device for EDFA Erbium-Doped Fiber Amplifier |
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CN102789026A (en) * | 2011-05-18 | 2012-11-21 | 亚洲光学股份有限公司 | Optical monitoring module |
US9366831B2 (en) * | 2014-07-18 | 2016-06-14 | Go!Foton Holdings, Inc. | Optical assembly |
JP6379898B2 (en) * | 2014-09-11 | 2018-08-29 | 住友電気工業株式会社 | Optical connector and optical connector manufacturing method |
CN105988167A (en) * | 2015-02-08 | 2016-10-05 | 韩朝阳 | Unidirectional optical power detector |
CN110661567B (en) * | 2018-06-29 | 2023-03-31 | 珠海保税区光联通讯技术有限公司 | Optical one-way tap monitoring device |
CN108761671A (en) * | 2018-06-29 | 2018-11-06 | 昂纳信息技术(深圳)有限公司 | A kind of compact Tap PD |
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US6389188B1 (en) * | 1999-02-23 | 2002-05-14 | Optical Coating Laboratory, Inc. | Hybrid wavelength selective optical router and switch |
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US20180039030A1 (en) * | 2016-08-05 | 2018-02-08 | Santec Corporation | Detection device |
US10126510B2 (en) * | 2016-08-05 | 2018-11-13 | Santec Corporation | Detection device |
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CN108873159A (en) * | 2018-06-19 | 2018-11-23 | 武汉电信器件有限公司 | A kind of integrated device for EDFA Erbium-Doped Fiber Amplifier |
Also Published As
Publication number | Publication date |
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US8664584B2 (en) | 2014-03-04 |
CN102043209A (en) | 2011-05-04 |
CN102043209B (en) | 2014-12-03 |
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